16
I10_092-01 • SILOX S_EN
M
aintenance
Item
Action
Frequency
(times/year)
3. Manual operation of safety
valves
î
Allow tank to cool.
î
Slowly twist open the relief valve.
î
Check that water flows freely.
î
Check that the valve reseats correctly when re-
leased.
1
4. Chemical Descaling
î
Isolate the tank from the DHW circuit.
î
Fit a de-scaling pump across the inlet and outlet.
î
Prime and run the pump, check that the circuit is
sound.
î
Gradually introduce the descaling agent until the
correct amount is added for the volume of water.
î
Run the pump and monitor the pH value, the pro-
cess is complete when the pH stabilises at less
than 0,8 for 20 minutes.
î
Neutralise the de-scaling agent with soda (NaOH)
to obtain a pH of 7.
î
Rinse the tank with fresh water.
î
After rinsing treat with a neutralising agent (having
a pH of approximately 9.
î
Rinse again.
As required
Presence of large quan-
tities of scale in the wa-
ter tank will reduce both
its capacity and perfor-
mance. In case of un-
softened water or hard
water, descale the tank
regularly.
i
